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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07ad0c05ba79c84a367420e6bcd8a39db1d8c035e8c52fa36108b2181357c14b' 
  AND token = 'S6Ii1Pmx+6I1f4H0V/Iju7GwMFg1VS7ES6o4bDZ/mWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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