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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61a6e37cb0c350b12264eb51305e8d5b7fdadf0d6244f651cedf75d9d20b11ba' 
  AND token = 'B86KPR8NyMIUsIfif1C7wZDpfZ763nJR6S48XRb+4Ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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