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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c55ec62446db5b2df4df3c9fa7616613417619498b90b9a2e64e52096905c6b' 
  AND token = 'S6HatisCkoO9pp42NOYB0Nt0PwW/xidZdePYoXC/XmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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