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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74913c49c3a4fef838d02ecea04b94e85e7b753580a149cd389c248f47d8f102' 
  AND token = 'Gberc69W1u4B8TwSE78X8Cg4xTo59Xf4+5kHfscS2AM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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