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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b77675d6c1ce19bca32d82cfcda6b91ad9d010d41002ca063adfd5a3a295eef' 
  AND token = '3iUJD9iXkUjW+SC2hYvTfeL/gEq90JiXxfeKWtMCsFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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