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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eaeef398ab75485356e793bca49e7104d7784f56c87488fb6f4ea54713c44ee' 
  AND token = 'j+M+VHHd6s82y+2+dkD/RH+6pe88+YCAfnr3B4aPJJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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