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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1a319fa97b96202c75a951031f8e774408d99dd8c5c5b2a80f8483d5b00d61f' 
  AND token = 'eY2inxVpxj4YgJMGxzsQOt1PpyB16n4HlcjtJyEHfCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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