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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c11bb7c4d3809f1d1a21995bd9390692edce3c35fb99a374d20cef554da8392' 
  AND token = 'JzPLnlnQRinCHPzs52i3YYjkG/0AH/ZWOtS9AVxTZfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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