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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3230bbc5b99055a1362e4738636707cfb23eb5937db8181d2e31efadc522c1b' 
  AND token = 'JiDMAzBa35bo4bDuUmxmct2fPiI7Fp0NEfvxbatuRXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00099

JSON explain

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