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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be62ae520a2719b002e76fc66ebee02c59c3b90f37a239942806c0cddee606b0' 
  AND token = 'TipI8+moUnv8vg6pEe4MFyx2OxklfGFP/5I0G7HdV5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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