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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06ad0f26e4a927b15b4a1221d6e66804e0483b98f9f79893d880dbc5e3a2a071' 
  AND token = 'TtQSRmm9FvZvrdEQvTx8DA4tFeP43C7NxEILCRRiEX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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