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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '961d3ebf508ad7fe577e0815515326a73933314fee948f4ac2fd61df96171957' 
  AND token = '+srm80s2UH4/LXYzAe/OQW933aq4/W5tyxaAlEV9BU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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