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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a97725bf1a81c2e57a8f271dcf8cdb90deae9b282913cc39bd0aca2763bb3fe0' 
  AND token = '48RoM5DSIL4NNFROT/fY+cj+vxNP/vS+WM60CgNbba0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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