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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '875201c14b36bccc17b9101ebdecb3f7d55eee58ddf9ebd58110bf5215289391' 
  AND token = 'rje97Dz2ECd+HVz1MUXzpfMUraXpH9a8WogrHErOpB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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