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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8aa74fcf8d6fde486203d44d4fadd7bddb295c01f89760b5d22179bc50c5bdf' 
  AND token = 'Adm5/nzyw/VGbtuJVznl10HvnhquPseIO6UQ2qDSdWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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