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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3a2311f83abb70ffe62dd20e074d04abc891b4dc30bad5501402a5ef6e48db1' 
  AND token = '/3QscpmK44JjoTxDIM9vB/y/P2wS/ETmorSLDSvGRhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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