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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b334e3fff58b9db089919216b1e1a94a5de03afce7584f11bc8a92ee600f7659' 
  AND token = 'gMvejrCk/bNBR2lU3thDfFrwnQuh44BxFg4G2xkErwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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