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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cce94c4b6beb78b43991b4d121690c581aeabc66a4cc0c48ed5aa0ff47b670f1' 
  AND token = '/azuVZhL1nqcZjoI1Wtjg/faazghRgCYGTCeTYBT5I0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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