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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5101ffe843bad7391c3f8f773a6de2a5b282161fe5a313836f93c2c62d23efab' 
  AND token = 'f2L/B+nVs9EENjoyuUyW1Y6Tf5K0W7tuC+p/YqItiSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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