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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0752c306e9b862ff66e47742eb3c8cb4b00ee985c299e1cfa29b1e6a8b6db2b4' 
  AND token = '53ZlLD3Q5VNxJf1HAfSK08JqW8pqtJcNpNnBUrzPtGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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