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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e70d869a37fae0f199d8a42ab6b6fa2ec65cb2e9c6f0a3e29bb636a4f1c991bd' 
  AND token = 'Ak2Bby+4Fhagj5xGe/veO3Ehvp9jv1y3r0FYPsFDtVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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