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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '144cd4df94ab2de63fe0a403b88bd862dd0803b2423b7a0f0fda0566cd96f5e4' 
  AND token = '767OmfuVX2QSXBCz4vIAOdsNVPgcmFgEw2XsKKDx2QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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