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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d4b4145985ab5cd406a93b7d406f9dbc9f7966d0c96b24e4fee774dc22ad251' 
  AND token = 'udWLj98Iy5yG6ALWoBjEOi0BjcWFNLZKSBFCYGMguD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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