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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b3c600784d9324a2971674ff338ecaf1d536871661379ec8caf21fb1a7f036a' 
  AND token = 't7y0zdsd5V1ZBAO1LXPRXfPCcbOXvbnS+IZWLWx438g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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