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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aba3d1e93bf7534d3ab76c4e4849aa96b97a3aa40a75862385f681afd4dd666e' 
  AND token = 'XfE1rtXbRr1pjkejRE+yzn5uzMAy7Wwd0I02VsAb0uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00079

JSON explain

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