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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fda36b1a339cc8155032717db2fa498734fe1e683aa6cdd18b11f1429caff05' 
  AND token = 'c3/KAFw4dYHsZs1qJZY2BAW1dGfVnwl1ArHYwkV/AOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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