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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbed7388952b709f176687e37abdca564ba9a77a6e19ad66d8250933e8a313fd' 
  AND token = 'Tn0PtAGO55BVO3pEMbSKHBA/Uf9M9Y6LHUWHcirI5g4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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