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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14cdc5a3f5c8edb7e0260ed9fb6af7fc1435abe4c10bf145a34a64eedaf0b105' 
  AND token = 'CX1V6+E0l3G+0pekDPbUnwM8KEPsbzCY9M/NYVL99VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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