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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b93bc86b2e1e54b65f151efb1a72d8603d75c629db7ba69125f9602b9dd6f21a' 
  AND token = 'VeamUz7nn73pSs6ytT8oXhzCtHQpuA4iwHmbdcLWW9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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