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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '390088bee03294b0593b1a5572d151d75e0fb51402d43aeb7e03e7b98f30312c' 
  AND token = 'K4KFq7zTnnlFK8uV0MHg3IQSqUxBaRZtGyMCY+fkJOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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