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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a4f7d52c9e8b065e3cc602794356cca496e72c1270e84e961cabd9f7ee6544a' 
  AND token = 'SvMH+5akNpB6dQV+MtYmDLKHxmiaoDYymRORyrAdsos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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