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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97d21ef27aef4535c5f080fe7eb961ac3e1680368b4360d014e60fd9d764852d' 
  AND token = 'eyg+faR+9GsAEdJUYYikA+k5x6N2gQFGPX/Cm2B6M14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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