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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba2f397f4c746d7afaaae08b969ec6b1042c973216d9b01256a92abe4c6c24af' 
  AND token = 'ciBT2dyHcDstIWyTU7Rj7RCatpsjH4KWc26anYFC+xQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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