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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0dd2f6bfa7334e659c4db46ee9cb8df49d18dd11977d0f1d037cb8320095e76' 
  AND token = 'tqrrWlalv9yMxZSbyMoANvnkVjfpt/VyMD9h7U3tZ9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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