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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c56dc367a8c7a7d3e69a3f872a8976b77e892a3a341fb4c539418c916f6e1c' 
  AND token = '1juLAkdra4sInQt6KR0AQKZ6VCQK/hkUjzO/fWqBFI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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