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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76696cbe0b48480d9d9d7f09491371b87464bd108f1406c3fbfd959b89c2eb73' 
  AND token = 'W88RXhTWaIGlyTfhJ1DGxUTMg3W015h3Qhd/QIiROk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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