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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '320d22624c2cd994c9b8bf762af851dedfd6afa11d94d580fe604c8cba0d6aa8' 
  AND token = 'OsXNIOm24WR0nb2Pj+3sDdZt9YsI0bcmm2e0PmXVJ/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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