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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e74f590858546d380ec11fd818fcc1ff77955b9ea245d60ecd2b3c9550a9ba85' 
  AND token = 'dXi+TEp1/UQrhtUsNxRtn0RTMU33zZ2gOBnLwurmXDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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