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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'babef156a7a99e833a17c847e9c9ff93db3289ee1f37010b3e9c45b4abfffa11' 
  AND token = '8y22I1DcQmzVE5+TM+N+sz/Qx1IJo2YpPnvnXwZ85fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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