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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '018c942194dd59d977e854b28da98c4ee3e3e59ec2f947659f0e51d57123e938' 
  AND token = 'fsBz/Le/iW4jAu4tKdxMD8gCYbSK+7Ph4XvqdiNitMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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