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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '906891fed5d5cd706fe15d12dbbc1fd16881f3f19e53b70df5bfd1390b2ec2b6' 
  AND token = 'cruOpWhn3NAHYaO/D83vhdAs3Xy8smYALPUJXId0Z0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}