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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24fbca624aa0ce1a9b909b5dd59a0869aeb07ffe01a63c162669a6b6b5fdd272' 
  AND token = '/QG4pwPAoxmvtMJY+079qYK7QeiLkVLpNMxdfpJWkds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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