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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9b90680d513c47d82fd02d2ccaa9cc7abe7023e50c63d1d663f9835f4c6fa63' 
  AND token = 'yRNkgtvaj3bJTmb7ondePhR2/bfRucn1b7gcm0LR5Is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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