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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51232ccb1c76ff51278b4c9528bb3c20069b6f2663159c4f84438252f2dff82d' 
  AND token = 'y83l0BqeESRLFYebDqc40ePyPju6AREsG/fajPub+2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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