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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1db9dfa9c85cb41ac87e7174344e3223149ce3d4a5f5bda8825998f3b548384e' 
  AND token = '38fc5n84zHZc6dORuLgoBHGT9DOpT6Sfl26V3EAtvho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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