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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2636fe8e6011e7e92abcb54ae55605dbc4faed087e581ae9287385ef4d70d713' 
  AND token = '8w/PEhoQxLZBakq4ecmOR/83wTsT1mVyJN7a6V55+ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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