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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e8748a62ec9b0a7e56c1ae78c317dce2f97005ee6051b1628990b57116382f' 
  AND token = '8kEtLfSJNaIKXx4ZlbiS3dWDbWXZWRC3cjFYFwe0A2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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