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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '025d204950579eca36d0127f48c2aa561438d35e6ddc2a8e707fa7b1bebbe833' 
  AND token = 'BHL8+m8suyquVkQjbaKbW+Q/T9H0L0syOiqv4jNurqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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