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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ae48ff9737a0c03f22f52be59bb5db85ca5ec519281059f393a4e0c864883c3' 
  AND token = '5yD2Wd+02RB6mGlF1lDvE7x7yDeregJvMjzbyj44kjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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