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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ad8f36a0e8381c53d5b0d2fca17852a8d236c2feb99b2c8c823dfba611a74c9' 
  AND token = 'mVzciiPSPCbrxm6RNA+iL8ktSZ67IIM5vE9foQCFIPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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