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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ebdb328bbf1ae1e8a36dac11732d5e37703c51cb7678ac3f6a758a2de3116d7' 
  AND token = 'Pv071NR2dHqd1vtzvKWDjyBUV0EDqcSFaNy6q1R+Dmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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