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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a0953d66d63f172a97aa1c5cb08200ab8cf4d1e9d800ad97f790dbde7c0b288' 
  AND token = 'DhSNcvhrGtH+He0JxLstCW+zBW6nRWtNjrG9Ve+Qzas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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