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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73c044f7acce79892df6b991ad867c2f177d289a13732a1bfa5f4a0764b501d3' 
  AND token = 'P2i8V8qmWWnbguXa9ozpRIV2++COOL8oUcpF9CT7hp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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