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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '808608f611db755c22f1f6575ed6514b96814b8ae14afbc8d6cdb3c831530f1b' 
  AND token = 'Z8c3W+n683c9oL9l9i75dH+EI8ecNcwkCZ83ezKD7O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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