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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f93e452f116147057d6159634da980cf4a016bb0f87402f40e4efc80b59797b3' 
  AND token = 'BykdHK5s284g+gs0OtmrlV5p6OQU3pGCHPadniy6Eew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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