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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1864d738426beba3acca5f7f015d72eb49e9d1a83d18e37d011dc91c4905c4d0' 
  AND token = 'hYfkHRrQgFhvbtIRG6RFhihKozNeNE9ys8T6ML6EP1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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