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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffd5bbdba64b0cef96a6853ea226b3df09695bc439cbcdfb05e0830d01a51be8' 
  AND token = 'e+stMSXktf7u3S+pqU0DjjSihyFFPDxltgvsQ1wcryo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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