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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09ae9bebc4c4d5abb7861722ecd09976db5dc1727016cb394e831b51e2e364c3' 
  AND token = '7aDJyozUrZ5/WRljwLBiDNI+9a6WR50Opgw6PJYmYLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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