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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b43f047700354f76c4019076ce4d8e31995d9e4c207af70e18c040ff76473e34' 
  AND token = '1nn2gKNPfoLafkDMevPDOjSVeFIPSGlEmwebls2Rgro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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