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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0bf8ab2621880ecfadcfa152c432becbb2720233af3e6e20b90559112209d11' 
  AND token = 'fsw41sQDykN1yK3oIyQ+1gE6l9oVr0K7+yWTPNPUwTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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